There are 3 testube in which solution is there . You have blue litmus solutio. How would you know that solution is acidic, basic or neutral.
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In basic the litmus paper would blu in colour
If it turns from blue to red then it is acid and from red to blue is basic so it is basic in nature
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Litmus is extracted from lichens. It has a mauve (purple) colour in distilled water. When added to an acidic solution, it turns red and when added to a basic solution, it turns blue. So, it is used to test the acidic or basic nature of solutions.
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